Are you saying that all Indians are now just one tribe? All 1.2 billion of them? That would be like saying all Chinese are just one tribe, or all Europeans are just one tribe. Come on, get real, dude.

Yes all Indians are descended from two huge migrations of ancestral humans. The paper I am quoting is from Harvard University.
Tribes is a cultural phenomenon dude.

In a study published in the September 24th issue of Nature, an international team describes how they harnessed modern genomic technology to explore the ancient history of India, the world's second most populous nation.

Your Euro-centric bias is astounding. Even the left-wing Marxist historians of India don't believe in Aryan and Dravidian races. Early phase of IVC is before 2500 BCE, it still was a civilization, its called the Ravi Phase which was 3500-2800 BCE.

Have you read the report of the ASI ? Let us be patient and not make hasty pronouncements.

If you & me knew something of the pre-Harappan phase, you'd expect the archaeologists of the ASI (Archaeological Survey of India) to know about it as well. Therefore, there must be something more to the news for the ASI to term it as a discovery. Let us wait for the full report to come out.

Perhaps some substantial new discoveries have been made. Previously, besides Mehrgarh no pre-IVC site was dated to earlier than 5000 BC. But it is being said in the news that Bhirrana in Haryana has yielded radio-metric dates of 7380 BC to 6201 BC. Plus, a few other sites are also mentioned as having been excavated. It would be interesting to know if these other sites also yielded such early dates.

That's exactly why I'm annoyed. All we have are a few soundbites transcribed by (probably) clueless reporters.

We don't know the actual language of the presentations, or the data that was found, or the methodology used.

I hope you have something substantial to back up those... strange numbers...

This page you quoted is a commentary by a student on the paper I quoted. Instead of trying to find opinions that fit your worldview, why don't you actually read what the authors of the paper wrote.

“Our study clearly shows that there was no genetic influx 3,500 years ago,” said Dr Kumarasamy Thangaraj of CCMB, who led the research team, which included scientists from the University of Tartu, Estonia, Chettinad Academy of Research and Education, Chennai and Banaras Hindu University.

“It is high time we re-write India’s prehistory based on scientific evidence,” said Dr Lalji Singh, former director of CCMB. “There is no genetic evidence that Indo-Aryans invaded or migrated to India or even something such as Aryans existed.”

The criticism of that paper is valid, it would have been interesting what the results would have been if the authors would have included the points made by the critics.
Generally, I think it would be interesting how Y-Haplogroup L relates to the IVC.